2017 Audi A4 Heater Isn't Working

Common Causes of Heater Malfunctions in Your 2017 Audi A4 and How to Resolve Them

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
31% chance it's the
Heater Blower Motor
0%
18% chance it's the
Heater Blower Motor Resistor
0%
51% chance it's
Something else
The most common reasons a 2017 Audi A4 heater isn't working are a broken heater blower motor, a problem with the thermostat, or a failed heater blower motor resistor.
  • Heater Blower Motor: A faulty heater blower motor can result in inadequate airflow or no air circulation in the cabin, affecting the heating system's performance.
  • Heater Blower Motor Resistor: A faulty heater blower motor resistor can cause inconsistent fan speeds or complete failure of the blower motor.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

What are the initial diagnostic steps to take when the heater isn't working in a 2017 Audi A4?

When your 2017 Audi A4's heater isn't functioning, start by checking the thermostat to ensure it's set correctly and operating as it should, as a malfunction here can significantly impact heating performance. Next, inspect the coolant level in the radiator; low levels can prevent the heater from generating warmth. If the coolant is adequate, turn your attention to the heater core, which may be clogged or leaking, obstructing heat flow. Additionally, assess the blower motor to confirm it's working properly, as a failure here will stop warm air from circulating. Don't forget to check the heater control valve, as a malfunction can disrupt the hot coolant flow necessary for heating. Lastly, consider bleeding the cooling system to eliminate any air pockets that might be hindering coolant circulation. By following these steps in order, you can effectively diagnose and potentially resolve the heating issue in your Audi A4.

What are the common problems that could cause the heater to stop working in a 2017 Audi A4?

When your 2017 Audi A4's heater stops functioning, it can be frustrating, but understanding the common problems can help you troubleshoot effectively. One of the primary culprits is a faulty thermostat, which may prevent the engine from reaching the optimal temperature needed for the heater to operate efficiently. Additionally, low coolant levels can significantly impact heat output, so checking the coolant reservoir is a good first step. Another potential issue is the heater core; if it is clogged or leaking, it can disrupt the flow of hot air into the cabin. The blower motor is also crucial; if it fails, you won't get any warm air, regardless of the heater's condition. Furthermore, air pockets in the cooling system can hinder coolant circulation, leading to inadequate heating. Lastly, a defective radiator cap can prevent proper coolant flow, affecting the heater's performance. By systematically checking these components, you can identify and address the issue, potentially saving on repair costs and ensuring your vehicle remains comfortable during colder months.

How urgent is it to repair the heater in a 2017 Audi A4 that isn't working?

When faced with a malfunctioning heater in a 2017 Audi A4, it is crucial to recognize the urgency of the repair. A heater that fails to operate not only compromises the comfort of the vehicle's occupants during cold weather but also poses significant safety risks. For instance, without a functioning heater, the defroster may not work effectively, leading to decreased visibility due to fogged or icy windows, which can be dangerous while driving. Moreover, a faulty heater could signal deeper issues within the vehicle's cooling system or electrical components, potentially resulting in more extensive and costly repairs if left unaddressed. Therefore, it is advisable to prioritize the inspection and repair of the heater by a qualified mechanic to diagnose the underlying problems and prevent further damage. Addressing this issue promptly ensures both the safety and comfort of everyone in the vehicle, making it a critical aspect of vehicle maintenance.

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2017 Audi A4 Heater Not Working: Causes & Repair Costs